National Weather Service Forecast for: San Marcos CA
Issued by: National Weather Service San Diego, CA
Updated: 2:04 am PDT Jul 6, 2025
 
Today

Today: Mostly cloudy, then gradually becoming sunny, with a high near 80. Light northwest wind becoming west 5 to 10 mph in the morning.
Decreasing
Clouds
Tonight

Tonight: Increasing clouds, with a low around 59. West wind around 5 mph becoming calm  in the evening.
Increasing
Clouds
Monday

Monday: Mostly cloudy, then gradually becoming sunny, with a high near 79. Light west wind increasing to 5 to 10 mph in the morning.
Decreasing
Clouds
Monday
Night
Monday Night: Partly cloudy, with a low around 61. West wind around 5 mph becoming calm  in the evening.
Partly Cloudy
Tuesday

Tuesday: Mostly sunny, with a high near 82. Light northwest wind becoming west 5 to 10 mph in the morning.
Mostly Sunny
Tuesday
Night
Tuesday Night: Patchy fog after 11pm.  Otherwise, partly cloudy, with a low around 64.
Patchy Fog
Wednesday

Wednesday: Patchy fog before 11am.  Otherwise, sunny, with a high near 85.
Patchy Fog
then Sunny
Wednesday
Night
Wednesday Night: Patchy fog after 11pm.  Otherwise, mostly clear, with a low around 65.
Patchy Fog
Thursday

Thursday: Patchy fog before 11am.  Otherwise, sunny, with a high near 87.
Patchy Fog
then Sunny
Hi 80 °F Lo 59 °F Hi 79 °F Lo 61 °F Hi 82 °F Lo 64 °F Hi 85 °F Lo 65 °F Hi 87 °F

 

Today
 
Mostly cloudy, then gradually becoming sunny, with a high near 80. Light northwest wind becoming west 5 to 10 mph in the morning.
Tonight
 
Increasing clouds, with a low around 59. West wind around 5 mph becoming calm in the evening.
Monday
 
Mostly cloudy, then gradually becoming sunny, with a high near 79. Light west wind increasing to 5 to 10 mph in the morning.
Monday Night
 
Partly cloudy, with a low around 61. West wind around 5 mph becoming calm in the evening.
Tuesday
 
Mostly sunny, with a high near 82. Light northwest wind becoming west 5 to 10 mph in the morning.
Tuesday Night
 
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 64.
Wednesday
 
Patchy fog before 11am. Otherwise, sunny, with a high near 85.
Wednesday Night
 
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 65.
Thursday
 
Patchy fog before 11am. Otherwise, sunny, with a high near 87.
Thursday Night
 
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 63.
Friday
 
Patchy fog. Otherwise, mostly sunny, with a high near 81.
Friday Night
 
Increasing clouds, with a low around 63.
Saturday
 
Mostly cloudy, then gradually becoming sunny, with a high near 79.

 

Forecast from NOAA-NWS for San Marcos CA.